PowerShell to find all available workflows in site collection & Subsites with their names & location.

$site = Get-SPSite("http://sharepoint.site.com/sites/abc");
$site.AllWebs | foreach { $_.Lists | foreach { $_.WorkflowAssociations | foreach {
write-host "Site URL :" $_.ParentWeb.Url ", List Name :" $_.ParentList.Title ", Workflow Name :" $_.Name
} } }


$siteurl="http://sharepoint.site.com/sites/abc"
$site=Get-SPSite("http://sharepoint.site.com/sites/abc");

#Initialize Workflow Count variable
$workflowcount = 0

#Foreach loop to loop through all webs, and lists with workflow associations, and exclude workflows that have previous versions and write findings to .csv file.

function Get-Workflows()
{
foreach($web in $site.AllWebs)
{
foreach($list in $web.Lists)
{
foreach($wf in $list.WorkflowAssociations)
{
if ($wf.Name -notlike "*Previous Version*")
{
$hash = @{"[URL]"=$web.Url;"[List Name]"=$list.Title;"[Workflow]"=$wf.Name}
New-Object PSObject -Property $hash | Sort-Object

}
}
}
}
}

foreach($web in $site.AllWebs)
{
foreach($list in $web.Lists)
{
foreach($wf in $list.WorkflowAssociations)
{
if ($wf.Name -notlike "*Previous Version*")
{
$workflowcount += 1
}
}
}
}

Get-Workflows | Export-csv E:\workflows.csv
"Workflow Count " + $workflowcount >> E:\workflows.csv

$site.Dispose()